Perhaps you should try some spelling variations:
tai khoa » da khoa, noi khoa
hang tai » hang va, dung tai
te sach » toc sach
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
cuc tre » duc tre, cua tre, cuu tre
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky sang) OR (ky tang)) tai khoa. hieu ve cam ((luc van) or (duc van)) hang tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky tang)) tai khoa. hieu ve cam ((luc van) OR (duc van)) hang tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) OR (ky tang)) tai khoa. hieu ve cam ((luc van) or (duc van)) hang tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky sang) OR (ky tang)) tai khoa. hieu ve cam ((luc van) or (duc van)) hang tai cuc tre*.